Pneumatic-tube system.



No. 735,861. I PATBNTED AUG. '11; 1903-.

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PNEUMATIC TUBE SYSTEM.

APPLICATION FILED D30. 1, 1902.

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No. 735,861. PATENTBD AUG. 11, 1903., W. G. DAVIS.

PNEUMATIC TUBE SYSTEM.

APPLICATION FILED DBO. 1, 1902.

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W. G. DAVIS. PNEUMATIC TUBE SYSTEM.

APPLIOATION FILED D110. 1, 1902.

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PNEUMATIC TUBE SYSTEM.

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APPLICATION FILED DEC. 1 1902.

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PNEUMATIC TUBE SYSTEM.

APPLIOATION FILED DEC. 1, 1902.

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PNEUMATIC TUBE SYSTEM. APPLICATION FILED D30. 1, 19oz.

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UNITED "STATES IPatented August 11, 1903.

' PATENT OFFICE.

lVILBUR GROVE DAVIS, OF NEWTON, MASSACHUSETTS, ASSIGNOR TO THE SINGLETUBE TRANSMISSION COMPANY, OF BOSTON, MASSACHUSETTS,

A CORPORATION OF MAINE.

PNEUMATIC-TUBE SYSTEM.

SPECIFICATION forming part of Letters Patent No. 735,861, dated August 11, 1903.

Application filed December 1. 1902. Serial No. 133,351. (No model.)

To all whom it may concern.-

Be it known that I, WILBUR GROVE DAVIS, a citizen of the United States,residing at Newton, in the county of Middlesex and Com- 5 monwealth ofMassachusetts, have invented an Improvementin Pneumatic-Tube Systems, ofwhich the-following description, in connection with the accompanyingdrawings, is a specification, like characters on the drawingsrepresenting like parts.

My invention relates to pneumatic-carrier systems, particularly tosystems wherein a single tube only is employed both for the outgoing andthe return carriers. i The various features of my invention will be bestunderstood from a description of oneembodiment thereof,.illustrated inthe accompanying drawings.

Referringto said drawings, Figure 1 shows in vertical section two of thecombined transmitting receiving heads connected by a singletransmission-tube, the latter being broken out to economize in' space,one of the said heads showing the parts in position for transmitting acarrier, the other of said heads showing the parts in position forreceiving the carrier. Fig. 2 is a perspective view of one of thecombined transmitting receiving heads with one form of pocket forreceiving 0 a carrier transmitted to said head; Fig. 3, a full-sizedetail of a portion of one of the com bined transmitting receivingheads; Fig. 4, a vertical sectional detail of a portion of Fig. 3; Fig.5, a cross-sectional detail on the dotted line 5 5, Fig. 4; Fig. 6, aview,-partially broken away, looking at the bottom of Fig. 3; Fig. 7, adetail looking from the left, Fig. 3, showing the self-containedarrangement of working parts whereby they may be removed as a unit fromthe inclosing case or structure; Fig. 8, a detail showing thereleasingswitch; Figs. 9, 10, and 11, details illustrating the variouspositions and movements of the conti-ollingvalve; Fig. 12, a detailshowing the arrangement of circuit-connecting devices for closing orestablishing simultaneously a plurality of circuits; Figs. 13 and 14,perspective details of parts of Fig. 12; Fig. 15, a view illustratingthe positions of the circuit-connecting device in the head; Fig, 5c; 16,a diagram illustrating the various cir .cuits; Fig. 17, a perspectiveview illustrat ing one grouping of a plurality of the combinedtransmitting receiving heads-for instance, at the cashiers stationandFig. 18 a detail showing the diaphragm e detached. In the particularembodiment of my invention selected for illustration and shown in the ldrawings, referring first to Fig. 1, the trans missiontube 1), ofsuitable material, construction, and diameter, is of suitable length .toextend from one to the other of the points between which it is desiredto transmit a cash or other carrier-for instance, from .the salesmanscounter to the distant cashiers deskeither upon the same or a'diflerentThis tube b terminates at its ends at two heads, (indicated generally bythe letters B 13,) which may be similar in construction and operationand which in accordance with my invention constitute combinedtransmitting and receiving heads-that is,heads which serve both as meansfor transmitting acarrier to a remote point, also for receiving acarrier transmitted from a remote point,contradistin- 7 5 guished inthis respect from the prevailing constructions wherein separatetransmitting and receiving heads are employed for each station. Sincethe heads, as shown, are identical, I will describe in detail one onlythereof, it being understood that the other is similar in all respects,corresponding parts being identified by similar reference characters.

Referring particularly to the head at the right, Fig. 1 and also'to Fig.2, the said head is hood-shaped to inclose the working parts, it beingadapted at its upper end to receive the adjacent end of thetransmission-tube b. In order that the same head may suflice for tubesof various diameters to accommodate carriers of various capacity, theend of the tube is seated in a bushing 12, which in turn is seated upona shoulder 29 in the head-casting B. By providing bushings of uniformoutside diameters and varying inside diameters tubes of varyingdiameters may be conveniently connected to one and the samehead-casting, thus eeonomizing in structural cost. Near the lower end ofthe casting B there is pivoted at ct a yoke-casting A, fitted at oneside, as at a, to form part of a receiver or receiving volute, which iscompleted by a preferably sheet-metal outer portion a, riveted orotherwise secured thereto and niade more or less open or basket-like inconstruction to gain lightness. At its opposite or front side the saidyoke A is provided with a ring-like arm a, threaded to receive thebushing c, which latter in turn is interiorly threaded to receive thelower end of the removable transmitter 0 By providing aseries ofbushings c of uniform outside diameters and varying inside diameterstransmitters of varying diaineters (corresponding in each case to thediameters of the particular transmitting-tube used) may be used inconnection with the same swinging yoke A. The receiver may usually bemade of one size or diameter sufficient for the largest carrier to beused, since closeness of fit between it and the carrier is notessential. Near their upper ends the transmitter c is supported by astrap 0 partially inclosing the same and secured at its ends, as byscrews 0 to a saddle c on the receiver ct. A spline or filler c isinterposed between the said saddle and said transmitter, which may bereplaced by one of different thickness when a transmitter of difierentdiameter is to be used. The strap of course is readily adaptable to anydiameter of transmitter. The location of the yoke-pivot at is such,herein at one side of the removable transmitter 0 that the said yoke maybe tipped outwardly or, as shown at the right in Fig. 1, to bring theupper end of the receiver into line with the lower'end of thetransmission-tube to receive a carrier from the latter and direct itinto the pocket P, Fig. 2, or the said yoke may be tipped inwardly intoits position, as shown at the left, Fig. 1, to cause the transmitter cto be brought into position in line with and forminga continuation ofthe transmission-tube. This location of the said pivot 0. also causesthe transmitter when tipped inwardly, as shown at the left, Fig. 1, tobe raised bodily,so that its upper end, which is preferably fitted witha lip or top 0 is lifted directly against and to make firm contact witha packing-ring c on the head-casting B and surrounding the end of thetransmission-tube, thus making a tight joint between adjacent ends ofthe said tube and transmitter to insure efficient transmission of acarrier from one to the other. In tipping the yoke outwardly again, asat the right, Fig. 1, the location of the pivot a causes the saidtransmitter c to drop directly away from the packed end of thetransmission-tube, thus insuring free and quick movement withoutunnecessary or ruinous frictional contact or wear.

Positioned between the side walls of the head'casting B is a base-plateD, from which depends a housing d, which contains a suitable valve-seatd, Fig. 4, conveniently ringlike in form and riveted or otherwisesuitably and preferably removably secured upon a shoulder formed withinsaid housing. 00- operating with the under side of this valveseat is acontrolling-valve d having a suitably-packed upper face and mounted upona bifurcated carrier d loosely mounted upon a pivot-pin d, which (seeFig. 6) is supportedat its ends in two ears d depending from thebase-plate D. The pivot end also of this valve-carryimg arm 61 isbifurcated to receive the pinion d, Fig. 6, which is also mounted uponthe said pivot d and is'engaged by a segment-geard depending from andscrewed to the bottom of the yoke A. The ends of the pinion d areprovided, respectively, with lugs d Figs. 9 to 11, which stand betweencooperaliug contact-surfaces d on the adjacent faces of the bifurcatedvalvecarrying arm, the said stop-surfaces d being separated by a greaterdistance than the lengths of the pinion-lugs d to provide between thesaid lugs and the said stop-surfaces a lost motion to permit a certainmovement of the said pinion before it commences to move thevalvecarrying arm and its valve.

Referring to Fig. 1, the depending housing d at its lower end is adaptedto be connected at (Z in suitable manner, as by a tube, with any desiredpressure-supply device, preferably one which will furnish stored oraccumulated pressure always at hand to be drawn upon when needed, butwhich may, if de sired, be a foot or other power pressure creating orfurnishing device, according to the requirements of any particularinstallation.

With the saddle A and its receiver and transmitter tipped outward, asshown at the right, Fig. 1, the position of the segmental gear d is suchthat the valve (1 is held in elevated position in contact with itsvalveseat d, cutting off thereat the supply of operating-pressure tothat end of the tube 1). The parts then, as stated, are in position toreceive a carrier transmitted from a distant station. When, however, itis desired to transmit a carrier from the station at the right, Fig. 1,the said carrier, which may be of any desired type, shape, orconstruction-- such, for instance, as indicated in dotted linesat thetop of Fig. 1is inserted with its pointed end upward in theforwardly-tipped transmitter 0 and the latter is tipped inwardly intoits vertical position, as shown at the left, Fig. 1, to cause it toregister with the adjacent end of the transmission-tube. Thisinward-tipping movement of the transmitter operates through thedepending segmental gear d to turn the pinion d in the direction of thearrow, Fig. 11, such movement of said pinion taking place withoutopening the valve until the pinion-lugs (Z meet the bottom stop surfacesd on the valve-carrier, when further movement of the said gear byrotating the pinion with it will cause the valve (1 to be turneddownwardly from its position, Fig. 11, into its position,

Fig. 9, thus opening communication between the pressure-supply throughthe transmitter 0 into the transmission-tube to impel the carrier fromthe said transmitter into and along the said tube to the distantstation, where it isdirected by the receiver a thereat into the pocketP.

The lost motion between the transmitter c and valve 61 enforces movementof the said transmitter a considerable distance toward its vertical ortransmitting position before the valve is opened to admit pressure whichwill or may move the carrier, thus preventing incomplete movement of thetransmitter from opening the valve and causing the carrier to beexpelled before the upper end of the transmitter has been brought intoregister with the end of the tube. The lost motion, as herein shown, issuch as to bring the end of the transmitter sufficiently under theadjacent end of the tube to prevent the carrier being expelled into theair rather than into the tube, thus guarding against accidentalexpelling of the carrier by a salesman idly or tardily moving thetransmitter c toward but not fully into its vertical position.

Upon return of the tipping transmitter c to its outermost position, asat the right, Fig. 1, the lost motion between the pinion d and thevalve-carrying arm d is again first taken up, as before, and thereafterand as the said transmitter approaches its full outermost position thesaid valve is lifted into its closed position again to cut off thesupply of pressure to that end of the tube.

To provide an air-tight joint between the base-plate D and the tippingtransmitter 0 which at the same time shall not impair the free movementof the said transmitter, I have provided a flexible diaphragm 6, Figs. 4and 18. This diaphragm is secured at its periphery to the base-platesurrounding the airpassage therein, while the inner edge of saiddiaphragm is suitably secured to the under side of the tippingtransmitter 0 herein by attaching said diaphragm to the bottom of thetransmitter-carrying arm a.

Since the tipping movement of the trans mitter at a point nearest pivotCt is less than the corresponding movement thereof'at the point farthestfrom the said pivot, I have provided more material in the said diaphragmnear its outer portion than at its inner porthere may be no tendency ofthe diaphragm when in either of its extreme positions to move thetransmitter c away from its eX-' treme position, I prefer to mold thediaphragm e or otherwise fit it so that it will tend to buckle or pullalways in one or the other direction, and thus tend naturally to assumeeither of the extreme positions into which it is moved by thetransmitter. Should there be any slight tendency of the diaphragm topull in either direction, it should be so arranged as to exert that pullin an effort to throw the transmitter-section 0 outward rather thaninward, thus to aid gravity in quickly restoring the parts to theirnormal positions at the completion of the fight of a carrier therefrom.l 7

Having described the mechanical operation of the parts necessary fortransmitting and receiving carriers, I will now describe'the means whichI have provided for locking the transmitters at opposite ends of thetube in their respective positions and otherwise controlling themovements thereof to guard against the possible simultaneousintroduction into the same transmission-tube of carriers traveling inopposite directions.

Referring to Figs. 1, 3, and 4, the lower end of the pivoted yoke A isprovided with a locking-lug f, adapted to cooperate with a locking-leverf, pivoted at f to and upon the housing d. This locking-lever isnormally depressed by a spring f and is supported from beneath by theupturned end of an armature-leverf, controlled by an electromagnetf alsomounted upon the housing or upon a plate f secured thereto. When themagnet f is energized, it will attract its armature, and thereby liftthe looking-lever f into its elevated locking position, where it willlock the said yoke in one or the other of its extreme positions.

Referring to Figs. 1, 7, and 8, there projects into the receiver a areleasing-switch f pivoted at f and having an arm f adapte ed to makeand break contact with the fixed member f on said receiver.

The yoke A, Fig. 3, at its lowerend and upon one side thereof has acontact-plate f adapted to cooperate with a fixed contactarm f fast onthe housing (1. When the saddle is tipped into its innermost position tobring the transmitter a into vertical operative position, thecontact-plate f makes contact with the arm f and the contact so made isof course broken when the said saddle' is tipped to carry the saidtransmitter again into its outermost position.

Referring now to the diagram of circuits, Fig. 16, the battery G orother generator is shown as having one of its poles connected by a wirelwith a Wire 2, which latter is joined at one of its ends to the movablecontact-plate f of the receiver at one stationfor instance, at theleftthe other end of said wire 2 being joined to the fixed contact-arm fof the housing dot the receiver at the opposite end. The fixed contact fof the re-' ceiver at the left, Fig. 16, is connected by a wire 3 withthe movable contactf ofthe receiver at the right, Fig. 16. The oppositepole of the battery or generator Gris con nected byawire 4 with theniagnetf at the right, Fig. 16, thence by wire 5 with the short arm f ofthe releasing-switch f the fixed contact f thereof being connected by awire 6 with the fixed contact f of the receiver at the opposite station.The short arm f of the releasing-switch f of the latter station isconnected by a wire 7 with the magnetf at said station, thence by ashort connection 8 with the wire 3, previously referred to as connectingthe contact membersf f of the two stations.

When the transmitters c at both stations are in their forward orinclined positions, all the circuits from the battery or generator G arebroken by separation of the fixed and movable contacts f f" at the twostations. Hence the magnets at the said stations are denergized, and thetransmitter at each station is free to be tipped inwardly preparatory totransmission of a carrier through the tube. If now a carrier be insertedin one of the transmitters c -for instance,that at the right, Fig. 16andthe latter tipped inwardly into its vertical position preparatory totransmitting its carrier through the tube, this in ward tipping movementwill cause its movable contact f to be turned into engagement with 00-operating fixed contact f, thereby completing a circuit, which may betraced as follows: from the battery or generator G by the wires 1 and 2to the right and through the engaging contacts f f, thence by the wire 3to the distant magnet f thence by the wire 7 to the contacts f f of thedistant receiver, returning by wire 6 to the contacts f" f of the firstreceiver, thence by wire 5 through the magnet f of the first receiverand by wire 4 back to the generator. The current thus energizes themagnets at both stations and causes the armatures thereof to beattracted, thereby to lift their respective locking-levers f intoelevated locking positions, the elevation of the locking-lever at thetransmittingstation causing it to assume a position behind thelocking-lug fon its receiver, thereby to look said transmitter in itsinward or vertical transmitting position, and simultaneously at theopposite station the elevation of the locking-lever thereat will causeit to assume a position in front of the locking-lugf of the distantreceiver, thus locking the latter in position to receive the transmittedcarrier. The parts remain thus locked until the carrier has completedits flight, when as it passes through the distant receiver a it willdeflect the releasing switch f and momentarily break the circuitthereat, thus deenergizing the locking-magnets at both stations andpermitting the transmitter from which the carrier was transmitted togravitate forward into its original or normal position. In similarmanner the insertion of a carrier in the transmitter at the distantstation, at the left, Fig. 16, and tipping of the same into verticalposition will cause the circuit to be established through its contacts ff, thereby to lock it in transmitting position and. simultaneously lockthe near receiver-that at the right-in its operative position, thecircuit being then traced as follows, viz: from the generator G throughthe wires 1 and 2 to the said distant receiver, thence through thecontacts f f wire 8, magnet f thereat, wire 7, contacts f f wire 6,110the near receiver at the right, contacts f f wire 5, magnet f and wire4, back to the generator. Thus it is impossible to push eithertransmitter into transmitting position during the period of flight of acarrier toward it from the opposite station, and also it is impossibleafter having tipped a transmitter inwardly for the transmission of acarrier to withdraw the same again to its normal or inoperative positionor to move any part at either station until that carrier has completedits flight. Thus conflicting carriers cannot be in the transmission-tubeat the same time, and a single tube may be safely used to transmitcarriers in both directions,and since the period of time required forthe flight of a carrier, even between widely distant or separatedpoints, is relatively very short one tube may by my invention beemployed substantially with the same capacity for transmission ofcarriers in both directions as two tubes, one for transmitting and onefor receiving.

A slight movement only of a transmitter is required to close the circuitand lock the distant transmitter and receiver against movement, thuspractically eliminating danger of the two transmitters at opposite endsof the tube being operated at the same time. To cause conflict, theymust be pushed in identicallyat the same instant, which is highlyimprobable. If one is started the slightest in advance of the other, itwill close the circuit and lock the said other before it is moved. Thebase-plate D, upon which the pivoted yoke A is mounted and to which thedepending housing dis attached, is removable as a IIO unit from thehousing B, thus to permit the ready removal of all the working parts ofthe head without disturbing their inoperative relationship and withoutdisturbing the end of the transmitter-tube or the housing which supportsthe same. This removable baseplate D may be secured within the housingin any suitable manner. I have found it convenient to employ the meansshown in Figs. 12 to 15, inclusive, which consists of tworetaining-levers h h, pivotally attached at h to the opposite inperfaces of the housing B and having their lower free ends turnedapproximately at right angles to form feet 71 adapted to rest upon andbe secured, as by screws h to the said base-plate. When it is desired toremove the said base-plate and its connected parts, the screws h areremoved and the retaining-levers turned upward, as into their dottedpositions, Fig. 12, thus permitting the base-plate and its connectedparts to be withdrawn through the open front of the housing B.

As a convenient means of forming ready electrical connection between thevarious partswhich are removable with the baseplate 1) and the parts ofthe wiring which must remain fixed with the transmitter-tube I havearranged upon the said removable base-plate in the rear of one of thesaid retaining-levers a vertical support h, provided with a series ofcontacts 9, 10, 11, and 12, to which are respectively eclectricallyconnected the releasing-lever f movable contact f, fixed contact f, andelectromagnetf. Upon the adjacent retaining-lever h are arranged othercontacts 13, 14, 15, and 16, to which are respectively electricallyconnected the ends of the Wires 6, 3, 2, and 4 or the correspondingwires at the opposite end of the line. When, therefore, the saidbase-plate D is placed in position and the retaining-levers h are turneddownwardly into and secured in their permanent full-line positions, Fig.12, the electrical-engagement of the contacts 9, 10, 11, and 12 with thecontacts 13, 14, 15, and 16 automatically makes the necessary electricalconnections at that station. Thus the act of removing the base-plate Dofitself breaks the electrical connections without disturbing therelationship thereof, and the act of restoring the said base-plate andlocking of the same in position automatically reestablishes the circuitswithout possible derangement thereof.

Referring to Fig. 17, I have shown a series of the combined transmittingreceiving-heads arranged side by side, as at a cashiers desk, so as torequire as little desk or table space as possible, and as a commonreceptacle for the carriers from all said heads I have suspended orotherwise secured below the table or desk top a receptacle P, which mayconveniently be of canvas, molded leather, or leather-board of properdimensions and having an inclined bottom adapted to direct the carriersfalling thereinto toward the front, which front is permitted to projectsomewhat beyond the front edge of the desk or table top and at the sametime is dropped somewhat below the under side thereof, so that thecarriers may conveniently be reached by a single operator. In fact, thetendency of the carriers is to gravitate into position directly in frontof the operator. This receiver or receptacle may conveniently be slungfrom the under side of the table by a lacing p, which is convenient bothbecause of its simplicity and because of the possibilities of readyadjustment which it presents. In this arrangement the said dependinghousing 01 may be connected with a common supply trough or conduit (1which is extended beneath the desk or tabletop, as shown in thedrawings. The apparatus here described is at once highly eflicient andpositive in its op eration and atthe same time is simple in constructionand readily adaptable to systems employing tubes and carriers ofdifferent diameters.

Obviouslythe carriers and tubes with their associated parts may be madeof such ca pacity, materials, shape, &c., as to adapt the system for thetransmission of cash, papers, parcels, or any other articles which it isdesired to transmit bya system operating upon the principle heredisclosed. A

My invention is not restricted to the particular embodiment thereofherein shown by way of illustration, for obviously the same may bevaried without departing from the spirit and scope of the inventionappearing from the foregoing description and drawings.

My invention in transmitter-receiver construction herein disclosed isadapted for use in the system described and claimed broadly in mycopendingapplication,Serial No. 84,297, filed December 2, 1901. Thepower required for propelling the carriers through the trans- 1 erwiseproduced, as by a foot-power or otherpressure-creating devicesuch, forinstance, as illustrated in my copending application, Serial No. 85,144,filed December 9, 1901.

I claim 1. In a pneumatic-carrier system, a movable, combinedtransmitter-receiver and a pressure-controllingvalve for saidtransmitter operated by the latter.

2. In a pneumatic-carrier system a normally dead transmission-tube, amovable transmitter therefor, a source of stored pressure normallyineifective for propulsion through said tube, and means automatically toadmit said pressure to said tube upon movement of said transmitter intooperative position, removal of said transmitter from said positionautomatically cutting off said propelling-pressure.

3. In a pneumatic-carrier system, a normally deadtransmission-tnbe,movable transmitters therefor located respectively atopposite ends of said tube and adapted respectively to be moved intooperative position relative to said tube for delivering a carrier to thelatter, a source of stored pressure normally inoperative for propulsionthrough said IIO 4. In a pneumatic-carrier system, a transmitting-tubeand an operating device at each end thereof comprising a transmitter anda receiver connected to be moved one by the other, the movement of oneinto operative position causing movementof the other out of operativeposition.

5. For a pneumatic-carrier system a combined movabletransmitter-receiver and automatic locking devices for the same.

6. In a pneumatic-carrier system atransmission-tube, atransmitter-receiver at each end, and automatic interdependent lockingdevices for the same.

7. In a pneumatic-carrier system, the combination with atransmission-tube of a movable combined transmitter-receiver at each endof said tube.

8. In a pneumatiecarrier system a normally dead transmission -tube, asource of stored pressure normally ineffective for propulsion throughsaid tube, means at each end of said tube to admit saidpropellingpressure thereat and carrier-holding means comprising amovable tube section at the ends of said tube but between the same andsaid pressure-admitting means for presenting carriers for transmissionthrough the said tube.

9. In a pneumatic-carrier system, a transmission-tube, means at each endof said tube to admit propelling-pressure thereat, and means atthe endsof said tube but between the same and said pressure-admitting means forpresenting carriers for transmission through and for receiving carriersfrom the said tube.

10. In a pneumatic-carrier system, a transmission-tube, means atopposite ends thereof to supply propelling-pressure thereat, valvesadjacent the ends of said tube to control the admission of suchpropelling-pressure, and carrier transmitting and receiving devices forsaid tube and between the said valves.

11. In a pneumatic-carrier system a transmission-tube, a movabletransmitter-receiver, and means for automatically establishing apropelling movement of air in said tube for the flight of a carriertherethrough on movement of said transmitter-receiver.

12. For a pneumatic-carrier system, a movable combinedIransmitterreceiver, and a pressure-controlling valve for saidtransmitter, connected with the latter and operated thereby.

13. Fora pneumatic-carrier system a movable transmitter, apressure-controlling valve therefor, and means to cause operation ofsaid valve by movement of said transmitter asynchronously therewith.

14. For a pneumatiocarrier system a movable transmitter, apressure-controlling valve therefor, and means to cause delayed movementof said valve by movement of said transmitter.

15. In a pneumatic-carrier system, a transmission-tube, and atransmitter adapted to abut against the same, the abutting end of thelatter having a longitudinal body movement toward and from the end ofsaid tube to bring the abutting ends into closer relation.

16. In a pneumatic-carrier system a transmission-tube, a movable tubulartransmitter adapted to abut against the same, the abutting endof thelatter having a longitudinal movement to and from said transmission-tubeto bring the abutting ends into closer relation and packing means forinsuring a tight joint between said tube and transmitter when moved intooperative relation one to the other.

17. In a pneumatic-carrier system, a transmission-tube, a movabletransmitter adapted to be moved into alinement therewith and removedtherefrom, means to admit propellingpressure through said transmitter,and diaphragm-packing means for said movable transmitter.

18. In a pneumatic-carrier system, a transmission-tube, a tippingtransmitter, means to admit propelling-pressure thereto, anddiaphragm-packing means therefor.

19. In a pneumatic-carrier system, a transmission-tube, an end supporttherefor, and a removable size bushing between the end of .said tube andits said support.

20. In a pneumatic-carrier system, a transmission-tube, a fixed endsupport therefor, a movable transmitter adapted to be alined with saidtransmission-tube, and pressurecontrolling means connected with saidtransmitter, and with the latter bodily removable from said supportwithout disturbing the latter.

21. In a pneumatic-carrier system a transmission-tube, an end supporttherefor, a movable transmitter-receiver, and pressure-admission meansadjacent thereto and operated by movement thereof, the saidtransmitterreceiver and pressure-admission meansbeing removable fromsaid end support Without disturbing the latter.

22. In a pneumatic-carrier system, a transmission-tube, an end supporttherefor, and a removable base with a transmitter-receiver, and apressure controlling valve carried thereby.

23. In a pneumatic-carrier system, a transmission-tube, an end supporttherefor, a removable base, a transmitter-reeeiver, apressure-controlling valve and automatic locking devices, all carried bysaid removable base.

24. In a pneumatic-carrier system, atransmission-tube, an open-fronthood to which it is connected, and a movable transmitter arranged insaid hood and having a movement in and out the open front thereof.

25. In a pneumatic-carrier system, a transmission-tube, a movabletransmitter, and a valve connected with and moved by saidtransmitter,the latter and valve having movements respectively inopposite directions.

26. In a pneu matic-carrier system, a transmission-tube, a movabletransmitter-holder and means to arrange therein transmitters ofdifferent diameters.

27. In a pneumatic-carrier system, a transmission-tube and mechanism atthe end thereof for controlling the transmission and receipt of acarrier through said tube and pressure st1pplying means and controllingdevices therefor, located at that side of said transmitting andreceiving means which is opposite to the said tube.

28. In a pneumatic-carrier system, a movable transmitter, a distantlocking device, and means for operating said distant locking device onmovement of said transmitter.

29. In a pneumatic-carrier system a movable transmitter-receiver, adistant locking device, and means for operating said distant lockingdevice on movement of said transmitter-receiver.

30. In a pneumatic-carrier system, a transmission-tube, transmitting andreceiving devices at the ends thereof, and means to enforce simultaneousoperative position of the transmitting device at one end of said tubeand the receiving device at the opposite end thereof.

31. In a pneumatic-carrier system, a transmission tube, transmitting andreceiving means at the ends thereof, and locking means to enforcesimultaneous relative position of the transmitting device at one end ofsaid tube and the receiving device at the opposite end thereof.

32. In a pneumatic-carrier system, a transmission-tube, movable,combined transmitting and receiving devices at opposite ends of saidtube and interlocking devices for enforcing predetermined position ofthe combined devices at one end of said tube upon predetermined positionof the combined devices at the opposite end of said tube.

33. In a pneumatic-carrier system, a transmission-tube and tipping,combined transmitting and receiving devices at opposite ends of saidtube, and locking means for locking the said tipping combined devices inpredetermined position one relative to the other during flight of acarrier through said tube.

- 34. In a pneumatic-carrier system, a transmission-tube, transmittingand receiving devices at opposite ends of said tube, and looking meanstherefor whereby movement of a transmission device at one end of saidtube into operative position thereby locks the transmission device atthe opposite end of said tube in inoperative position, and vice versa.

35. In a pneumatic-carrier system, a transmission-tube, transmitting andreceiving devices at opposite ends of said tube, and looking meanstherefor whereby movement of a transmitting device at one end of saidtube into operative position locks the receiving device at the oppositeend of said tube also in operative position.

36. In a pneumatic-carrier system, a transmissiontube, and a movabletransmitter therefor pivoted at one side the axis of said tube to swinginto and out of a position augularly inclined thereto.

37. In a pneumatic-carrier system, a transmission-tube, a movabletransmitter therefor, and means to force the abutting ends of said tubeand transmitter together, as the latter is moved into its transmittingposition.

38. In a pneumatic-carrier system, a movable transmitter and apressure-admission valve geared to said transmitter.

39. In a pneumatic-carrier system, a transmission-tube, a source ofpropelling-pressure therefor, a movable transmitter adapted in oneposition to receive a carrier preparatory to despatching it through saidtransmissiontube when in another position, and pressureits receivingposition.

40. In a pneumatic-carrier system, a transmission-tube having a movabletransmitter, and diaphragm-packing means for said movable section.

41. In a pneumatic-carrier system, a movable transmitter, a lockingdevice to lock said transmitter in any one of a plurality of positions,and normally maintained out of locking engagement with said transmitterand an electromagnet for throwing said locking device into lockingengagement with said transmitter.

42. In a pneumatic-carrier system, a normallydead transmission-tubeadapted for the transmission of a carrier in either direction, means forestablishing a propelling movement of air at either end thereof, amovable controlling device at each end to control said means, and meansfor locking the controlling device at the distant or receiving end inits inoperative or receiving position on the initial movement of thecontrolling device at the sending end toward its operative ortransmitting position.

43. In a pneumatic-carrier system, a movabletransmitter, a lockingdevice, and means for locking said locking device on the initialmovement of said transmitter.

44. In a pneumatic-carrier system a movable transmitter-receiverconnected to be moved one by the other and an automatic locking devicefor the same.

45. In a pneumatic-carrier system, a movable transmitter-receiver, and ahood for the same.

46. In a pneumatic-carrier system,the combination of atransmission-tube, a movable carrier-holdin g transmitter at each endthereof adapted to be movedinto and out ofits transmitting position, andmeans to enforce an inoperative position of the transmitter at one endwhen the transmitter at the other end is moved into its transmittingposition.

47. In a pneumatic-carrier system the combination of atransmission-tube, a movable carrier-holdin g transmitter at each endthereof adapted to be moved into and out of its transmitting position,and means to establish a propelling movement of air in the sendingdirection through movement of one of said transmitters to itstransmitting position and to maintain the same during the flight of acarrier.

- 48. Inapneumatic-carrier system, a transmission-tube, a movabletransmitter therefor adapted to receive a carrier for delivery to saidtube and having a movement into and out of its transmitting positionrelatively to the end of said tube and a receiver to receive a carrierfrom said tube when said transmitter is out of its transmittingposition.

49. In a pneumatic-carrier system, a mov able transmitter, apressure-controlling valve therefor and operated thereby, and anautomatic locking device therefor.

50. In a pneumatic-carrier system, a transmission-tube, a movabletransmitter having a movement into and out of its transmitting positionto transmit a carrier in one direction, and receiving means cooperatingtherewith to receive a carrier from the opposite direction and adaptedto divert the same toward the operator.

51. In a pneumatic-carrier system a transmission-tube, a movabletransmitter adapted to be moved into and out of operative positionrelatively thereto, and means for locking the same in either position.

52. In a pneumatic-carrier system, a transmission-tube, a movableoperating device, a stationary support therefor, electriccontrolling-circuits for said operating device and leading from contactsthereon, corresponding contacts on said support and means for removablysecuring said operating device to said support, and for simultaneouslybringing said support and operating device contacts together.

53. In a pneumatic-carrier system, a transmission-tube adapted for thetransmission of a carrier in either direction, a pipe or conduit forconnection to the end of the same, to admit pressure thereto,pressure-controlling means therefor, a movable transmitter adapted to bemoved into a transmitting position, to connect said pressure-pipe withthe end of said transmission-tube and to operate saidpressure-controlling means thereby, and a receiver to receive a carrierfrom said transmission-tube end when said transmitter is out oftransmitting position.

54. In a pneumaticcarrier system, a transmitting-tube, a movabletransmitter-receiver therefor, and means automatically to admitpropelling-pressure to said tube upon movement of saidtransmitter-receiver into transmitting position, removal of saidtransmitterreceiver from said position automatically cutting off saidpropelling-pressure.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

WILBUR GROVE DAVIS.

Witnesses:

ALICE RICHMOND BROWN, SUSAN ETHEL HAYNES.

